1.1 本试验方法主要用于可视化和测量用作燃料电池或内燃机驱动车辆燃料的氢气中颗粒的大小和形态。本试验方法描述了获得已知质量的尺寸和形态数据所需的程序。只要满足用户的数据质量目标，该测试方法可应用于需要测定颗粒大小和形态的其他气体样品。 1.2 在标准中提及商品名并不构成认可或建议。 可以使用其他设备制造商、软件或设备型号。 1.3 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 质子交换膜燃料电池（PEMFC）等低温燃料电池需要高纯度氢，以实现最大的材料性能和使用寿命。FCV和氢动力内燃机车辆中使用的氢气中的微粒可能会对气动控制部件（如阀门或其他关键系统部件）产生不利影响。颗粒尺寸和形态的可视化是确定颗粒来源以及设计颗粒形成减少策略的重要工具。

1.1 This test method is primarily intended for visualizing and measuring the sizes and morphology of particulates in hydrogen used as a fuel for fuel cell or internal combustion engine powered vehicles. This test method describes procedures required to obtain size and morphology data of known quality. This test method can be applied to other gaseous samples requiring determination of particulate sizes and morphology provided the user’s data quality objectives are satisfied. 1.2 Mention of trade names in standard does not constitute endorsement or recommendation. Other manufacturers of equipment, software or equipment models can be used. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Low temperature fuel cells such as proton exchange membrane fuel cells (PEMFCs) require high purity hydrogen for maximum material performance and lifetime. The particulates in hydrogen used in FCVs and hydrogen powered internal combustion vehicles may adversely affect pneumatic control components, such as valves or other critical system components. The visualization of the size and morphology of particles is an important tool for determining particle origin as well as for devising particle formation reduction strategies.